8-[2-(6,6-dimethyl-bicyclo[3.1.1]hept-2-yl)-ethyl]-3-(3-methylamino-propyl)-1-phenyl-1,3,8-triaza-spiro[4.5]decan-4-one 、
1-噁-6-氮杂螺[2.5]辛烷-6-羧酸-1,1-二甲基乙酯 在
potassium carbonate 、
Sodium sulfate-III 、 raw material 作用下,
以
乙醇 为溶剂,
以yielding a light yellow viscous oil (3.51 g, 5.15 mmol, 89.8% yield)的产率得到4-{[(3-{8-[2-(6,6-dimethyl-bicyclo[3.1.1]hept-2-yl)-ethyl]-4-oxo-1-phenyl-1,3,8-triaza-spiro[4.5]dec-3-yl}propyl)-methyl-amino]-methyl}-4-hydroxy-piperidine-1-carboxylic acid tert-butyl ester